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Gas fraction estimation is the use of simple formulae (models) to estimate the gas (gas fraction) or kinds of gas in, for example, a galaxy. Such a simplified method may be used with survey data to perform such estimates on a large number of bodies using available data. Such formulae are devised using a more complicated means of determining gas fractions, then using correlations relating them to suspected useful parameters in a sample population. Example formula (for Sloan Digital Sky Survey data):
log10(GHI/S) = - 1.73238(g - r) + 0.215182μi - 4.08451
where:
Such formulae are devised for different redshifts, in particular to identify star formation potential.